| Income Taxes - Components of Deferred Tax (Detail) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017 | 
|---|---|---|
| Deferred tax assets (liabilities): | ||
| Net operating loss carryforward | $ 25,628,753 | $ 23,343,153 | 
| Accrued vacation | 30,051 | 26,286 | 
| Non-qualified stock compensation | 566,367 | 334,655 | 
| Restricted stock | (808) | 27,877 | 
| Total deferred tax assets, net | 26,224,363 | 23,731,971 | 
| Less valuation allowance | (26,224,363) | (23,731,971) | 
| Total net deferred taxes | $ 0 | $ 0 | 
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation related to restricted stock. No definition available. 
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- References No definition available. 
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from compensated absences (includes, but not limited to, sick and personal days). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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| X | ||||||||||
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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